Pentti Nieminen

Prof. Pentti Nieminen

University of Oulu, Oulu, Pohjois-Pohjanmaa, Finland
orcid

Research Focus & Metrics

Academic Career Length

37Years (1990-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 September 1999 in Stroke
Verified
Journal Article
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MKM.-L. Kauhanen
M.-L. Kauhanen
JKJ. T. Korpelainen
J. T. Korpelainen
PHP. Hiltunen
P. Hiltunen
EBE. Brusin
E. Brusin
HMH. Mononen
H. Mononen
VMV. V. Myllylä
V. V. Myllylä
Background and Purpose —The prevalence of poststroke depression is known to be high, but the knowledge of its neuropsychological correlates is limited. This 12-month prospective study was designed to evaluate the natural history of poststroke depression and to study its neuropsychological, clinical, and functional associates. Methods —We studied a series of 106 consecutive patients (46 women and 60 men, mean age 65.8 years) with acute first-ever ischemic stroke. The patients underwent a neurological, psychiatric, and neuropsychological examination at 3 and 12 months after the stroke. The psychiatric diagnosis of depression was based on DSM-III-R-criteria. Results —Depression was diagnosed in 53% of the patients at 3 months and in 42% of the patients at 12 months after the stroke. The prevalence of major depression was 9% at 3 months and 16% at 12 months. There was an association between poststroke depression and cognitive impairment; the domains most likely to be defective in stroke-related depression were memory ( P =0.022), nonverbal problem solving ( P =0.039), and attention and psychomotor speed ( P =0.020). The presence of dysphasia increased the risk of major depression. The depressive patients were more dependent in ADL and had more severe impairment and handicap than the nondepressive patients. Conclusions —More than half of the patients suffer from depression after stroke, and the frequency of major depression seems to increase during the first year. In addition to dysphasia, poststroke depression is correlated with other cognitive deficits. We emphasize the importance of psychiatric evaluation of stroke patients.

1 May 2001 in Spine
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Journal Article
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JKJaro Karppinen
Jaro Karppinen
AMAntti Malmivaara
Antti Malmivaara
MKMauno Kurunlahti
Mauno Kurunlahti
EKEero Kyllönen
Eero Kyllönen
TPTuomo Pienimäki
Tuomo Pienimäki
HVHeikki Vanharanta
Heikki Vanharanta
A randomized, double-blind trial was conducted. To test the efficacy of periradicular corticosteroid injection for sciatica. The efficacy of epidural corticosteroids for sciatica is controversial. Periradicular infiltration is a targeted technique, but there are no randomized controlled trials of its efficacy. In this study 160 consecutive, eligible patients with sciatica who had unilateral symptoms of 1 to 6 months duration, and who never underwent surgery were randomized for double-blind injection with methylprednisolone bupivacaine combination or saline. Objective and self-reported outcome parameters and costs were recorded at baseline, at 2 and 4 weeks, at 3 and 6 months, and at 1 year. Recovery was better in the steroid group at 2 weeks for leg pain (P = 0.02), straight leg raising (P = 0.03), lumbar flexion (P = 0.05), and patient satisfaction (P = 0.03). Back pain was significantly lower in the saline group at 3 and 6 months (P = 0.03 and 0.002, respectively), and leg pain at 6 months (13.5, P = 0.02). Sick leaves and medical costs were similar for both treatments, except for cost of therapy visits and drugs at 4 weeks, which were in favor of the steroid injection (P = 0.05 and 0.005, respectively). By 1 year, 18 patients in the steroid group and 15 in the saline group underwent surgery. Improvement during the follow-up period was found in both the methylprednisolone and saline groups. The combination of methylprednisolone and bupivacaine seems to have a short-term effect, but at 3 and 6 months, the steroid group seems to experience a "rebound" phenomenon.

1 March 2004 in The British Journal of Psychiatry
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Journal Article
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PTPekka Tienari
Pekka Tienari
LWLyman C. Wynne
Lyman C. Wynne
ASAnneli Sorri
Anneli Sorri
ILIlpo Lahti
Ilpo Lahti
KLKristian Läksy
Kristian Läksy
KWKarl-Erik Wahlberg
Karl-Erik Wahlberg
Background: Earlier adoption studies have convincingly confirmed the importance of a genetic contribution to schizophrenia. The designs, however, did not incorporate observations of the rearing-family environment.Aims: To test the hypothesis that genetic factors moderate susceptibility to environmentally mediated risks associated with rearing-family functioning.Method: A Finnish national sample of adopted-away offspring of mothers with schizophrenia-spectrum disorders was compared blindly with adoptees without this genetic risk. Adoptive rearing was assessed using family rating scales based upon extended family observations at initial assessment. Adoptees were independently re-diagnosed after a median interval of 12 years, with register follow-up after 21 years.Results: In adoptees at high genetic risk of schizophrenia, but not in those at low genetic risk, adoptive-family ratings were a significant predictor of schizophrenia-spectrum disorders in adoptees at long-term follow-up.Conclusions: Adoptees at high genetic risk are significantly more sensitive to adverse v. ‘healthy’ rearing patterns in adoptive families than are adoptees at low genetic risk.

31 August 2022 in BioMedInformatics
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Pentti NieminenPentti Nieminen
Pentti Nieminen
The lack of consistent presentation of results in published studies on the association between a quantitative explanatory variable and a quantitative dependent variable has been a long-term issue in evaluating the reported findings. Studies are analyzed and reported in a variety of ways. The main purpose of this review is to illustrate the procedures in summarizing and synthesizing research results from multivariate models with a quantitative outcome variable. The review summarizes the application of the standardized regression coefficient as an effect size index in the context of meta-analysis and describe how it can be estimated and converted from data presented in original research articles. An example of synthesis is provided using research articles on the association between childhood body mass index and carotid intima-media thickness in adult life. Finally, the paper shares practical recommendations for meta-analysts wanting to use the standardized regression coefficient in pooling findings.

1 September 2006 in BMC Medical Research Methodology
Verified
Journal Article
Open access
Pentti NieminenPentti Nieminen
Pentti Nieminen
JCJames Carpenter
James Carpenter
GRGerta Rucker
Gerta Rucker
MSMartin Schumacher
Martin Schumacher
Background: Citation counts are often regarded as a measure of the utilization and contribution of published articles. The objective of this study is to assess whether statistical reporting and statistical errors in the analysis of the primary outcome are associated with the number of citations received. Methods: We evaluated all original research articles published in 1996 in four psychiatric journals. The statistical and reporting quality of each paper was assessed and the number of citations received up to 2005 was obtained from the Web of Science database. We then examined whether the number of citations was associated with the quality of the statistical analysis and reporting. Results: A total of 448 research papers were included in the citation analysis. Unclear or inadequate reporting of the research question and primary outcome were not statistically significantly associated with the citation counts. After adjusting for journal, extended description of statistical procedures had a positive effect on the number of citations received. Inappropriate statistical analysis did not affect the number of citations received. Adequate reporting of the primary research question, statistical methods and primary findings were all associated with the journal visibility and prestige. Conclusion: In this cohort of published research, measures of reporting quality and appropriate statistical analysis were not associated with the number of citations. The journal in which a study is published appears to be as important as the statistical reporting quality in ensuring dissemination of published medical science.

1 April 1999 in Stroke
Verified
Journal Article
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JKJuha T. Korpelainen
Juha T. Korpelainen
Pentti NieminenPentti Nieminen
Pentti Nieminen
VMVilho V. Myllylä
Vilho V. Myllylä
Background and Purpose—The aim of this study was to assess effects of stroke on sexual functioning of stroke patients and their spouses and to study the associations of clinical and psychosocial factors with poststroke changes in sexual functions.Methods—One hundred ninety-two stroke patients and 94 spouses participating in stroke adjustment courses sponsored by the Finnish Stroke and Aphasia Federation completed a self-administered questionnaire concerning their prestroke and poststroke sexual functions and habits. The main outcome measures were (1) libido, (2) coital frequency, (3) sexual arousal, including erectile and orgastic ability and vaginal lubrication, and (4) sexual satisfaction.Results—A majority of the stroke patients reported a marked decline in all the measured sexual functions, ie, libido, coital frequency, erectile and orgastic ability, and vaginal lubrication, as well as in their sexual satisfaction. The most important explanatory factors for these changes were the general attitude toward sexuality (odds ratio [OR] range, 7.4 to 21.9; logistic regression analysis), fear of impotence (OR, 6.1), inability to discuss sexuality (OR range, 6.8 to 18.5), unwillingness to participate in sexual activity (OR range, 3.1 to 5.4), and the degree of functional disability (OR range, 3.2 to 5.0). The spouses also reported a significant decline in their libido, sexual activity, and sexual satisfaction as a consequence of stroke.Conclusions—Sexual dysfunction and dissatisfaction with sexual life are common in both male and female stroke patients and in their spouses. Psychological and social factors seem to exert a strong impact on sexual functioning and the quality of sexual life after stroke.